Me with american history questions!

Arandom variable x has a mean of 10 and a standard deviation of 3. if each value of x is multiplied by 2, what will the new mean and standard deviation be?

Maria is late for school sometimes because she is not a morning person. if maria is at school from 8: 00 a. m. to 3: 00 p. m. every day and volunteers at an animal shelter on the weekends, when would be the best time for her to study? a. before school b. right after school c. during the weekend d. before she goes to bed

Asocial class is a category of people who share similarities in which attribute? a. intelligence b. religion c. age , race and gender d wealth , power , and prestige